[Grid] seat in the actual project often increases the elastic support rubber pad in the top beam or capitals, especially in large-span truss, the seat by rubber advances to meet the requirements of the temperature stress of the deformation, which requires beam or column consider the elastic stiffness and rigidity of the superposition of the elastic rubber pad, when the K1 and K2 overlay, superimposed by the displacement superimposed lent stiffness K is: 1 / K = 1 / K1 + 1 / K2; there is K = 1 / (1 / K1 + 1 / K2). [Grid holder] (JOINTS) elastic support to produce the corresponding displacement ratio, reaction force and displacement at the same time provide a reaction force remain unchanged, called stiffness elastic support. Elastic support can provide mobile grid constraints bearing manufacturers assured purchase., Also provides a rotational constraint. When bearing stiffness and rigidity similar structure, it should be simplified as an elastic support. When a part of the structure to withstand loads (eg Structural Stability) finished truss bearing good quality and price priority! Which can be regarded as an adjacent portion of the elastic support portion, bearing stiffness depends on the stiffness of the adjacent part (such as the cable-stayed bridge cable-stayed simplified as spring bracket). When bearing stiffness is much greater than or much smaller than the rigidity of the portion of the elastic support is ideal seat forward four transformation. [Grid] bearing grid (net shell) structure is generally supported in capitals or lower support ring beams and other Internet frame bearing structure, bearing node refers to grid nodes located on the support structure. It is connected to the grid to the support of the Concurrent rod members, but also to support the entire grid, and in grid (net shell) on the load transfer to the lower support structure. Therefore, bearing node is the link truss structure with the lower supporting structure linked, but also the entire structure of an important part. [Grid] a reasonable bearing JOINTS force must be clear, transfer simple, safe, reliable, simple and reasonable structure should also be done to prepare simple steel grid bearing factory outlets, with better economy. Ball bearings are developed on the basis of basin-type rubber bearing on a new bridge bearings. With the development of bridge technology, the emergence of a large number of bridges and wide curved bridge, in the early 1970s on the development of a foreign ball bearings, it is designed to be much larger than the angle rubber bearing basin, usually 0.01 ~ 0.01rad, necessary When can achieve 0.05rad. Design reaction force from 1MN ~ 30MN. Since 1988, cooperation by the Ministry of Railways Institute of Science and the Ministry of Development Xinjin 筑路机械厂 ball bearings, and through after six 2MN ball bearing system development, repair pressing the cable-stayed bridge in Shanghai Huangpu Bridge main bridge with a ball bearing 10MN the fixed bearing design angle of 0.042rad. 1991 but also in the West Wing roadworks Tiananmen Square in Beijing, temple and CaiHuYing and other widely used overpass ball bearings 3 ~ 12.5MN, the current ball bearings are widely used in the domestic cities and highway overpass bridges Suppliers use. Maximum tonnage on highway bridges ball bearings for 145MN (Chaotianmen Bridge), the railway bridges have been designed and ball bearings for the maximum tonnage of the finished 180MN (Yangtze river bridge). The main difference with the ball bearing rubber bearing basin is: pot rubber bearing steel pot by turning the rubber to meet the needs of the corner of the bridge, due to the rotation of rubber and rubber anti-torque diameter, thickness and hardness of, Therefore, when the holder is rotated, with the change of angle of the holder, the holder of the rotating counter moment changed accordingly, and bearing the rubber thickness is limited and is generally 1/10 to 1/15 the diameter of the rubber, and therefore basin rubber bearing design angle is generally 0.012 ~ 0.02rad. Grid bearing, space frame holder in line with national standards! , Scouring cheaper by-Engineering Rubber Co., Ltd. Hengshui. Hengshui-Engineering Rubber Co., Ltd. (www.grgcxj.cn) (www.grgcxj.cn) is specialized in "earthquake spherical steel bearing, one-way two-way sliding spherical steel bearings, ball joints fixed elastic damping bearings," the enterprises, companies adhering to the "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr. Wang.